Back cover of massage gun



FIG. 1 is a rear, right and top perspective view of a back cover of massage gun, showing my design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left side elevation view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is a top plan view thereof.

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged view of an area labeled 8 in FIG. 1 .

The broken lines depict environmental structure of the back cover of massage gun that form no part of the claimed design. 

CLAIM The ornamental design for a back cover of massage gun, as shown and described. 